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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0c370e24de9e55bc6bf162eee30de67ac5b8ce87ddf9370a92edfd3770aaaa' 
  AND token = '5N1e9up8I7CCwLxEV7P/b+Q3NPlsTn9HPkA7VtQY1wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}